1. to keep pace with others; to maintain the same level of progress as peers or competitors
She studied hard to not fall behind in her classes.
Ela estudou muito para não ficar para trás em suas aulas.
2. to avoid lagging in development, advancement, or achievement compared to others
The company must innovate to not fall behind its competitors.
A empresa deve inovar para não ficar para trás de seus concorrentes.